envi-code/SourceCode/Code2026/inc/singleton.h

#pragma once

template <typename T>
struct Singleton
{
	struct object_creator
	{
		object_creator(){ Singleton<T>::instance(); }
		inline void do_nothing()const {}
	};

	static object_creator create_object;

public:
	typedef T object_type;
	static object_type& instance()
	{
		static object_type obj;
		//据说这个do_nothing是确保create_object构造函数被调用
		//这跟模板的编译有关
		create_object.do_nothing();
		return obj;
	}

};
template <typename T> typename Singleton<T>::object_creator Singleton<T>::create_object;